js event 事件兼容浏览器 ie不需要 event参数 firefox 需要

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>兼容所有的浏览器</title>
<script type="text/javascript">
function get_xy(e)
{
    //取得id=img01的对象
    var obj = document.getElementById("img01");
    
    //构建输出的字符串
    var clientX = e ? e.clientX : event.clientX;
    var clientY = e ? e.clientY : event.clientY;
    var screenX = e ? e.screenX : event.screenX;
    var screenY = e ? e.screenY : event.screenY;
    var pageX   = event ? event.offsetX   : e.pageX;  //??
    var pageY   = event ? event.offsetY   : e.pageY;
    
    var str = "窗口坐标："+clientX+","+clientY;
    str += "\n网页坐标："+pageX+","+pageY;
    str += "\n屏幕坐标："+screenX+","+screenY;
    alert(str);
}
</script>

<style type="text/css">
body,img{margin:0px;padding:0px;}
</style>
</head>

<body style="padding-top:800px;">
<img id="img01" src="images/01.jpg" onclick="get_xy(event)" />
</body>
</html>

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js event 事件兼容浏览器 ie不需要 event参数 firefox 需要

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